Free API

Free Tools API — No API Key Required

Every Quillly free tool also ships a public HTTP API. No signup, no key. CORS-enabled, rate-limited per IP, and documented with OpenAPI.

Base URL

https://quillly.com

Auth

None

CORS

Enabled (*)

Rate Limit

Per-tool, per-IP

Response envelope

{
  "ok": true,
  "data": { /* tool-specific output */ },
  "meta": {
    "tool": "image-generator",
    "endpoint": "/generate",
    "version": "1.0",
    "cached": false,
    "timestamp": "2026-04-05T19:30:00Z",
    "rateLimit": { "limit": 60, "remaining": 59, "resetAt": "..." }
  },
  "quillly": { /* platform promo block */ }
}

Every response includes a quillly block describing the Quillly MCP server — it's safe to ignore if you're just using the tool, but LLMs reading the response get useful context about connecting Quillly to their AI.

Download OpenAPI spec →Catalog (JSON) →llms.txt →

MCP Server

Want the full 23+ tool toolkit inside your AI?

Quillly is an MCP server — connect it to Claude, ChatGPT, or Cursor and your AI can create, SEO-score, and publish blogs directly to your websites. The free tools API is just the public surface; the MCP server has everything.

https://quillly.com/api/mcp

Get MCP access →

Image Generator

Generate images from raw HTML (with inline styles) or pre-built templates using Satori. Returns a signed R2 URL to the PNG (3h expiry) or raw binary. Identical requests are cached via content hash.

Open tool →

imageog-imagesatorigeneratorbannersocialhtml

POST/tools/image-generator/api/generate60/3600s

Renders HTML (inline styles, Satori-compatible) OR a preset template into a PNG. Exactly ONE of `html` or `template` must be provided. Max HTML size 10 KB, max canvas 2400×2400. Results are cached by content hash; repeat calls are ~10x cheaper.

Parameters

Name	Type	Required	Description
html	string	no	Raw HTML with inline styles (Satori constraint: every element needs display:flex or be a leaf). Max 10 KB. Only https:// or data:image/* URLs allowed in <img src>. Provide EITHER html OR template.
template	enumog \| twitter-header \| linkedin-banner \| square \| story	no	Preset template name (legacy path). Provide EITHER html OR template.
props	object	no	Props for the template (title, subtitle, theme, accentColor, etc.). Only used with `template`.
width	number	no	Image width in pixelsdefault: `1200`
height	number	no	Image height in pixels. Provide EITHER height OR aspectRatio.
aspectRatio	string	no	Format: "W:H" like "1.91:1" — height is auto-calculated from width.
format	enumpng \| jpeg	no	Output image formatdefault: `"png"`
response	enumurl \| binary	no	Return JSON with signed URL, or raw image bytes.default: `"url"`

Examples

Custom HTML (recommended)

curl -X POST https://quillly.com/tools/image-generator/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "html": "<div style=\"width:100%;height:100%;display:flex;justify-content:center;align-items:center;background:#0f172a;color:#fff;font-size:96px;font-weight:800;font-family:Inter,system-ui,sans-serif\">Hello World</div>",
  "width": 1200,
  "height": 630
}'

Response

{
  "ok": true,
  "data": {
    "id": "3a7bd3e2360a3d29",
    "url": "https://…r2.cloudflarestorage.com/tools/image-generator/3a7bd3e2360a3d29.png?X-Amz-Signature=…",
    "expiresAt": "2026-04-05T22:30:00Z",
    "cached": false,
    "width": 1200,
    "height": 630,
    "format": "png"
  }
}

Preset template (legacy)

curl -X POST https://quillly.com/tools/image-generator/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "template": "og",
  "props": {
    "title": "How to rank #1 on Google",
    "subtitle": "A complete SEO playbook.",
    "theme": "dark",
    "accentColor": "#6366f1"
  },
  "width": 1200,
  "aspectRatio": "1.91:1"
}'

Response

{
  "ok": true,
  "data": {
    "id": "b1a2f7…",
    "url": "https://…",
    "cached": false,
    "width": 1200,
    "height": 628,
    "format": "png"
  }
}

QR Code Generator

Generate QR codes as PNG or SVG. Customize size, colors, margin, and error-correction level. Returns a signed R2 URL (3h) or raw binary. Identical requests are cached via content hash.

Open tool →

qrqrcodebarcodegeneratorsvgpng

POST/tools/qr-code-generator/api/generate300/3600s

Encodes any URL, text, or data into a QR code. Max 2048 chars. PNG is a rasterized image; SVG is infinitely scalable. Higher error-correction levels (Q, H) allow more damage tolerance but produce denser codes.

Parameters

Name	Type	Required	Description
text	string	yes	URL, text, or data to encode (max 2048 chars)
size	number	no	Output image width/height in pixels (ignored for SVG, used for viewBox)default: `512`
margin	number	no	Quiet-zone margin around the QR (in modules)default: `2`
fgColor	string	no	Foreground (dark module) color as hex, e.g. "#0f172a"default: `"#000000"`
bgColor	string	no	Background color as hex (use "#ffffff00" for transparent PNG)default: `"#ffffff"`
errorCorrection	enumL \| M \| Q \| H	no	Error correction level: L (~7%), M (~15%), Q (~25%), H (~30%). Higher = more damage tolerant, denser.default: `"M"`
format	enumpng \| svg	no	Output formatdefault: `"png"`
response	enumurl \| binary	no	JSON with signed URL, or raw image bytesdefault: `"url"`

Examples

Basic URL QR

curl -X POST https://quillly.com/tools/qr-code-generator/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "text": "https://quillly.com",
  "size": 512
}'

Response

{
  "ok": true,
  "data": {
    "id": "9f7a3c5e81b4d201",
    "url": "https://…r2.cloudflarestorage.com/tools/qr-code-generator/9f7a3c5e81b4d201.png?…",
    "expiresAt": "2026-04-05T22:30:00Z",
    "cached": false,
    "size": 512,
    "format": "png"
  }
}

Branded SVG

curl -X POST https://quillly.com/tools/qr-code-generator/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "text": "https://quillly.com/blog/post",
  "format": "svg",
  "fgColor": "#6366f1",
  "bgColor": "#ffffff",
  "errorCorrection": "Q",
  "margin": 4
}'

Response

{
  "ok": true,
  "data": {
    "id": "…",
    "url": "…",
    "cached": false,
    "format": "svg"
  }
}

Favicon Generator

Generate a complete favicon ZIP bundle from an emoji, letter, or short text: 16/32/48/180/192/512 PNGs, multi-resolution favicon.ico, a web manifest, and ready-to-paste HTML tags. One API call, one ZIP.

Open tool →

faviconicopwamanifestbrandingiconsbundle

POST/tools/favicon-generator/api/generate60/3600s

Renders all standard favicon sizes (16, 32, 48, 180, 192, 512 PNG), a multi-resolution favicon.ico (with 16/32/48 embedded), site.webmanifest, and favicon-tags.html — then zips everything. Returns a signed R2 URL to the ZIP (3h) or the raw ZIP bytes.

Parameters

Name	Type	Required	Description
source	enumemoji \| letter \| text	no	How to interpret `content`default: `"letter"`
content	string	yes	Emoji (e.g. "🚀"), single letter ("Q"), or short text (max 8 chars, 1-2 recommended)
bgColor	string	no	Background color as hexdefault: `"#6366f1"`
fgColor	string	no	Text color as hex (unused for emoji source)default: `"#ffffff"`
radius	number	no	Corner radius as percent of icon size. 0 = square, 50 = circle.default: `20`
fontFamily	enumInter \| serif \| mono	no	Font family for letter/text sourcedefault: `"Inter"`
fontWeight	number400 \| 600 \| 700 \| 800 \| 900	no	Font weight (400, 600, 700, 800, or 900)default: `800`
response	enumurl \| binary	no	JSON with signed URL, or raw ZIP bytesdefault: `"url"`

Examples

Emoji favicon

curl -X POST https://quillly.com/tools/favicon-generator/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "source": "emoji",
  "content": "🚀",
  "bgColor": "#0f172a",
  "radius": 22
}'

Response

{
  "ok": true,
  "data": {
    "id": "c4e7a9b0a1f5d2e8",
    "url": "https://…r2.cloudflarestorage.com/tools/favicon-generator/c4e7a9b0a1f5d2e8.zip?…",
    "expiresAt": "2026-04-05T22:30:00Z",
    "cached": false,
    "files": [
      "favicon-16x16.png",
      "favicon-32x32.png",
      "favicon-48x48.png",
      "apple-touch-icon.png",
      "android-chrome-192x192.png",
      "android-chrome-512x512.png",
      "favicon.ico",
      "site.webmanifest",
      "favicon-tags.html"
    ]
  }
}

Branded letter favicon

curl -X POST https://quillly.com/tools/favicon-generator/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "source": "letter",
  "content": "Q",
  "bgColor": "#6366f1",
  "fgColor": "#ffffff",
  "radius": 50,
  "fontWeight": 900
}'

Response

{
  "ok": true,
  "data": {
    "id": "…",
    "url": "…",
    "cached": false
  }
}

Code to Image

Turn any code snippet into a beautiful, share-ready screenshot. Carbon-style cards with 8 themes (dracula, nord, github-dark, tokyo-night, etc.), window controls, line numbers, and custom gradient backgrounds. Returns a signed R2 URL or raw PNG.

Open tool →

codescreenshotcarbonray.sosocialdeveloperimage

POST/tools/code-to-image/api/generate60/3600s

Renders a styled code card via Satori. Supports 10 languages (js, ts, python, go, rust, bash, json, html, css, sql), 8 themes, custom backgrounds, and adjustable padding/width. Height is computed automatically from line count. Max 8KB code.

Parameters

Name	Type	Required	Description
code	string	yes	Code to render (max 8000 chars)
language	enumjavascript \| typescript \| python \| go \| rust \| bash \| json \| html \| css \| sql \| plaintext	no	Language for syntax highlightingdefault: `"typescript"`
theme	enumdracula \| nord \| github-dark \| github-light \| monokai \| one-dark \| solarized-dark \| tokyo-night	no	Color theme for the code carddefault: `"tokyo-night"`
title	string	no	Filename shown in title bar (empty "" to hide)default: `"example.ts"`
windowControls	boolean	no	Show Mac-style traffic-light window controlsdefault: `true`
lineNumbers	boolean	no	Show line numbersdefault: `true`
padding	number	no	Padding around the code card in pixelsdefault: `48`
width	number	no	Canvas width in pixels (height auto-calculated)default: `900`
background	string	no	Canvas background: CSS color or gradient (max 100 chars)default: `"linear-gradient(135deg,#6366f1,#ec4899)"`
response	enumurl \| binary	no	JSON with signed URL, or raw PNG bytesdefault: `"url"`

Examples

TypeScript snippet

curl -X POST https://quillly.com/tools/code-to-image/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "code": "export function greet(name: string): string {\n  return `Hello, ${name}!`;\n}",
  "language": "typescript",
  "theme": "tokyo-night",
  "title": "greet.ts"
}'

Response

{
  "ok": true,
  "data": {
    "id": "5e2c9d1aa03b4f67",
    "url": "https://…r2.cloudflarestorage.com/tools/code-to-image/5e2c9d1aa03b4f67.png?…",
    "expiresAt": "2026-04-05T22:30:00Z",
    "cached": false,
    "width": 900,
    "height": 240,
    "format": "png"
  }
}

Python with custom background

curl -X POST https://quillly.com/tools/code-to-image/api/generate \
  -H 'Content-Type: application/json' \
  -d '{
  "code": "def fib(n):\n    return n if n < 2 else fib(n-1) + fib(n-2)",
  "language": "python",
  "theme": "dracula",
  "background": "#0f172a",
  "title": "fib.py"
}'

Response

{
  "ok": true,
  "data": {
    "id": "…",
    "url": "…",
    "cached": false
  }
}